Locomotive exhaust pipe



Jan. 25 ff. 1,522,232 I s. H.'DUNNING Locomo'rivm EXHAUST FIRE I i l a1924 2 Sheets-She'i l of Paterson, in thecounty of Passaic and- PatentedJan. 6, 1925. V

UNITED/STATES SAMUEL H. nunnme, or rafrnnson, new

'LOCOMOTIVE EXHAUST PI'PEQ Application-filed January 21, 1924. SerialNo. 687,661;

To all whom it may concern:

Be it known that I, SAMUEL H. DUNNING,

State of New Jersey, have invented a certain new and useful Improvementin Locomotive Exhaust Pipes, of which improvement the following is aspecification.

My invention relates to means-for discharging the exhaust steam andgaseous products of combustion from the smoke boxes of locomotive or.other boilers operated under forced draught, and? its objectis toprovide an appliance, in the operation of which the exhaust steam andthe smoke box gases will be more completely and effectively commingledthan heretofore,

and the back pressure be reduced to a lower degree than in ordinarypractice.

The improvement claimed is hereinafter fully set forth. 7 I

The discharge openings of the nozzles of locomotive exhaust pipes have,in some cases, been made of an'irregular or eccentric form for thepurpose of increasing the entraining surface of the steam jet, and, inother cases, the. exhaust steam has been discharged through an annularpassage, surrounding an opening through which a portion of the smoke boxgases was discharged, but the ratio of the discharge area of the steamjet to its surrounding surface has not, in practice, been foundsufficiently small to produce the maximum entraining effect.

My invention is designed to attain this effect by the provision of aplurality of gas ducts, leading into the steam discharge pas sage of theexhaust pipe, so as to penetrate the body of the exhaust steam jet,whereby an appreciable portion of the smoke box gases is delivered incomparatively small streams, completely surrounded by the exhaust steamjet, which is subdivided by the incoming gases adjacent to its point ofdischarge from the exhaust pipe. The commingling of the exhaust steamand the smoke box gases, and the entrainment of the latter are, by thisconstruction, promoted to a degree which has not been found practicablein devices of the prior art.

In the accompanying drawing: Figure 1 is a vertical longitudinal centralsection through the smoke box of a locomotive boiler, illustrating anapplication of my invention; Fig. 2, a plan or top view, on

a an enlarged scale, of the exhaust pipe,

showing; the interstitialu "spaces as -ot .irregular shapeyFig. .3, asimilar .view,

showing the interstitial spaces as :of substantially vrectangularform;Fig. 4, a partial vertical sectionthrough' thecexhaust pipe; and, Fig.5,a partial side vie\v,partly in section, ofthesame. v

.In the .practiceof my invention, referring desc-riptively to" thespecific embodiment thereof which-is herein. exemplified, the body ofthe exhaust; pipe, -1, is slightly tapered outwardly from its bottom toits top, and is provided with a'bottom flange, 1", which is adapted tobe secured to the cylindersaddles in the usual position, that is tosay,'.with the exhaust pipe located, in

the smoke box,'2-, in line axially with the A pluralityof inclined openbottomed gas ducts, ,4, extends through the wall of the exhaust .pipe,.1, said ducts beingdisposed symmetrically around the axis of the exhaustpipe, and being alternately of greater and? lesser length, 'as'indicated most clearly in Fig. 1. As shown in Figs. 2, 3an d 4, the

gas ducts 4 ta er' upwardly and extend through the we lof the exhaustpipe 1 to points where they almost contact each other.

In the form of Fig. 2, the top ends'of said duets are left circular incross-section, so that the steam spaces between them'are of irregularshape, while in the form of Fi 3, the top ends are made pointed towar sthe axis of the pipe 1, so that the spaces between them are ofrectangular shape. For the purpose of providing additional avenues ofgas supply to the exhaust pipe, gas ducts, 4", of shorter length, may belocated above the longer gas ducts, as shown in Fig. 4.

In order to promote and accelerate the flow of the gases through the asducts, 4, they may,-if desired, be provi ed with the accelerator tubes,4, on. their inner sides, as shown in Fig. 4, through which tubes,portions of the jet of exhaust steam are admitted into the gas ducts, soas to promote the upward traverse of the gases through them.

The application of an exhaust pipe of the construction substantially asabove dein a plurality of jets, surrounded by exhaust steam, reduces thetendency to form eddies in the body of gas, which arewell recognized asbeing detrimental to its free flow. The sudivision of the steam in theexhaust pipe into a plurality of narrow bands, exposes a greatlyaugmented surface to the gases, with a corresponding increase in theefiiciency'of the ejection.

I claim as my invention and desire to secure by Letters Patent 1. -In alocomotive exhaust pi e, the combinationv of an open ended tu ular-body,adapted for connection to an exhaust steam passage; and a plurality ofgas ducts, extending into said body to points adjacent the axis thereof,so as to leave spaces between their inner ends for the passage ofexhaust steam to the discharge opening of the body.

2. "In a locomotive exhaust pipe, the combination of an open endedtubular body, adapted for connection to an exhaust steam passage; and aplurality of gas ducts, ex-- tending through the wall of said body topoints adjacent the axis thereof, so that the inner ends of the saidducts are surroundel by spaces for the passage oi exhaust steam to thedischarge opening of the body.

3. In a locomotive exhaust pipe, the com bination of an open endedtubular body adapted for connection to an exhaust steam passage; and aplurality of gas ducts, ex-

tending through the wall of the body, and opening into the body inaplane adjacent to A the discharge opening thereof, the open ends of saidducts being surrounded by Spaces for the passage of exhaust steam to thedischarge opening of the body.

4. In a locomotive exhaust pipe, the combination of an open endedtubular body,

adapted for connection to an exhaust steam passage; and aplurality ofgas ducts, of alternately greater and lesser length, extending throu hthe wall of thebody, and opening into te body in a plane adjacent to thedischarge opening thereof, said ducts being surrounded by spaces for thepassage of ex haust steam to the discharge opening of the body. v

5. In a locomotive exhaust pipe, the combination of an open endedtubular body, adapted for connection to an exhaust steam passage; aplurality of gas ducts, extending throughthe wall of the body andopening therein, said ducts being surrounded by spaces for the passageof exhaust steam to the discharge opening of the body; and acceleratortubes, leading from said interposed spaces into the gas ducts.

6. In a locomotive exhaust pipe, the combination of an open-endedtubular body, adapted for connection to an exhaust steam passage; and aplurality of gas ducts, extending through the wall of said body topoints adjacent the axis thereof, the inner ends of said ducts being soshaped as to leave passages of rectangular shape between them for thepassage of exhaust steam to the discharge opening of said body.

SAMUEL H. DUN NING.

I lVitnesses:

J. BNOWDEN BELL, GEORGE E. BROWN.

